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1 definition by dulcederonda

 
1.
be tight-arsed or tight-assed(British & Australian, very informal, American, very informal)

to be worried about small details that are not important.

Cambridge International Dictionary of Idioms © Cambridge University Press 1998

Don't ask Jack to get involved, he's so tight-assed and really irritating.
by dulcederonda January 30, 2008